AP® Physics 1 & 2

Three Bulbs and Energy

APPH12-YEX9WN

A student wants to compare three light bulbs that are all connected directly to a $120\text{-volt}$ source. The lights are a $60\text{-watt}$ incandescent bulb (traditional), a $30\text{-watt}$ compact fluorescent (CFL), and a $10\text{-watt}$ light emitting diode (LED).

Which statement below is correct?

A

The current in the traditional bulb has a current that is $36$ times greater than the current in the LED bulb.

B

The energy used by the CFL bulb in one hour is equal to the energy used by the traditional bulb in three hours.

C

In the same time that $100\text{ coulombs}$ of charge flow through the CFL bulb, at least $300\text{ coulombs}$ of charge will flow through the LED bulb.

D

In the same time that the LED bulb uses $2\text{ kJ}$ of energy, the traditional bulb will use $12\text{ kJ}$ of energy.